Improvement in chisels



W. KING.

Chisel.

No. 204,439. Patented June 4,1878.

Wnedded .jmen fir I NJHENS. FHOTO-UTHOGRAPRER, WASHINGTON. D C

UNITED STATES PATENT OFFICE.

WILLIAM KING, OF LONDON, ENGLAND, ASSIGNOR TO HENRY HALL, OF SAME PLACE.

IMPROVEMENT IN CHISELS.

Specification forming part of Letters Patent No. 204,439, dated June 4,1878; application filed April 3, 1878.

To all whom it may concern:

Be it known that I, WILLIAM KING, of 67 Strand, in the city of Londonand Kingdom of Great Britain, have invented a new and useful Improvementin Tools for Cutting Tenons', which improvement is fully set forth inthe following specification, reference being had to the accompanyingdrawings.

The improvements consist in the construction and use, for the purposesof cutting tenons and other like purposes, of three cutters, a centerand two lateral ones, the side cutters bein g adjustable to the size ofthe work required, and the center cutter removable, so that a singletenon can be cut as well as a double, shapin g the inner side of thelateral cutters so that their inner sides may be shorter than theirouter, and so that their cutting-edges shall be at an angle of thirtydegrees, more or less, to the vertical of the tool when in position,said edge being flat on the face of the tool and beveled on the backside; lastly, in combination with the above arrangement of tools, theturning up or grooving the inner edges and points of the lateral tools,to prevent their tendency to spread and so neutralizing the pressure onthe outside cutters.

The cutters can be of metal, preferably steel, fixed to a metal frame orblock, and have mortises or other convenient contrivance therein, in andby which the tools can be received and held, and by means of set-screwsor other fasteners they can be maintained in various positions, asdesired. The block is to be furnished with a socket, and can be placedand used in any ordinary mortising-machine.

The drawing hereunto annexed will serve to show a practical mode ofcarrying out my invention.

A B O are the three cutters placed on a frame bar or block, F, on whichthey can he slid or adjusted, and fixed, when in adjustment, by theset-screws E E E. Passing through the tools and mortises in the frame FG is the socket with a screw attachment, by means of which it and theframe F is fixed to the plunger of an ordinary mortising-machine.

The drawing shows the faces of the tools; the backs are beveled so thatthe inner sides are thicker than the outer.

For cutting one shoulder of a tenon shorter than the other, gages ordistance-pieces of the thickness necessary are used, placed between theframe and one of the lateral cutters, so that one side cutter stands outfrom the plane of the other the distance required, and is operated atthat distance, being clamped in position on and by the screw E, which ismade long enough for the purpose.

I claim as my invention- The combination, in tools for cutting tenons,of three cutters adjustable to the size and nature of the work, andshaped, all substantially as described, and for the purposes set forth.

WILLIAM KING.

Witnesses:

H. I. HADDON,

67 Strand, London, England. L. G. SILVEsTER,

67 Strand, London, England.

